Maintenance
Feb. 13, 2017 - Several years ago, Foothills Forest Products had a difficult time finding a home for the shavings being produced by its planer mill operations at its sawmill in Grand Cache, Alta.
Feb. 13, 2017 - For as long as mill workers have been running wood through saws we have understood the importance of having every part of the machine positioned at exactly the right pre-determined location and angle to facilitate the smooth passage of the log and the straightest cut possible. A very small change in the inclination of a roll can mean the difference between a good day and a disaster. A slightly off angled saw will heat up and destroy itself in short order.
Feb. 13, 2017 - Warp can be the result of both the inherent characteristics of wood as well as a number of introduced (process-related) variables. Through proper handling and management of the drying operations we can have an influence on the severity and amount of warp occurring from either cause. This article will highlight a number of specific ways in which those losses can be minimized to have a positive monetary impact on your operation.
Dec. 20, 2016 - It was announced earlier in December that Lavern Heideman & Sons would be upgrading its facilities.

The Eganville, Ont.-based company’s $16.9-million expansion project includes modernizing infrastructure, purchasing new equipment and consolidating operations.

“Right now we have two sawmills on the site — a bandmill for larger diameter logs and a scragg mill for nine inches and under,” vice-president of Lavern Heideman & Sons Kris Heideman told Canadian Forest Industries. “And it’s the big log line, the 10 inch and up line that we’re rebuilding. And then we’re also adding in kilns and planing and remanufacturing capabilities.” 

Heideman said specific equipment has already been chosen for the upgrade. 

“There will be a 130-bin sorter and stacker by Piché, T-S Manufacturing for the sawmill [and] the rest is to be determined,” Heideman said. “The sorter and stacker will start up in December 2017 and the new sawmill will start up in spring of 2018.”

Heideman says productivity and efficiency gains are the main goals of the expansion project, which will also create 18 new jobs.

“There is the potential to add another shift on top of what we’re doing currently, but that being said there will be jobs added on the finishing, remanufacturing and packaging lines,” Heideman said.

He also added that production will go up about 60 per cent as a direct result of the upgrades.

“Just through our improvements and our processes for the big log line, and the newer equipment, and significant upgrades, and optimization and scanning capabilities will all improve our efficiency and our productivity,” Heideman told CFI.

Heideman said he is most looking forward to the modernization of the plant and the security that will be provided for employees “that will be competitive well into the future.”

The Lavern Heideman & Sons upgrade is poised to be a positive project for the entire Eganville area.

“It’s significant to note it’s not just the hundred and some jobs at the mills,” Heideman said. “It’s the harvesting activities that support the wood flow not only in our mill, but other sawmills and pulp mills, biogas plants, MDF plants, all benefit from the increased harvesting activity on the landscape. And it’s good for the forest management and our forests going forward.”



RELATED: Lavern Heideman & Sons embarking on $16.9-million sawmill expansion

Sawmill has limited options
Nov. 25, 2016 - The name of the game in the saw trade is precision. Measurements are to the thousands of an inch. Tension, clearances and speeds are all carefully calculated. It makes sense therefore that the machinery upon which we mount those saws should be equally precise, thus the necessity for grinding bandmill wheels.
Oct. 13, 2016 - If you have worked in a sawmill for any length of time, then you have seen it happen many times. The saws are running great, the mill is producing and everybody is happy. Then all of a sudden, the saws start wandering, or there is a wreck, and then another wreck. Nobody is too worried at first, these things happen right?

Aug. 16, 2016 - On the surface, levelling a saw sounds pretty simple. You just put a straight edge against the saw with a light behind it and look for a dark spot. Then you hit it with a hammer until it is gone. In reality, levelling a saw is very difficult to learn and perform properly.

Aug. 16, 2016 - When it comes to keeping a sawmill’s debarkers running in tip-top shape and preventing unnecessary downtime, the key is proactive maintenance.

June 21, 2016 - When it comes to saw filing, definitive rules are hard to come by. What works for one saw filer might be a disaster for another. If you have two mills from the same company manufacturing the same products with similar equipment, the natural assumption from mill managers and purchasing agents is that standardization should be possible and profitable – and sometimes it is. But more often than not, the success of the first mill can be difficult to duplicate in another.

The problem with attempting uniformity between sawmills is that every combination of machinery, employees, wood diet and environmental conditions produces a different animal. The same can be said for saw filers. How a person sees light and shadow, how tall they are, their physical strength, their experience, and even how they hold their hammer, will all affect how that person works a saw and what the end result will be.

Sure, there are basic standards within the trade that you can reasonably expect to be consistent – tire-lines will be more or less where you expect them to be; saws will be as level as possible and tension will be the correct amount to run properly for the application. But here’s the rub, it’s how the combination comes together that is more important than what each individual component looks like, and that is controlled by the experience and preferences of the filer.

For example, a question that gets asked often is, “Why do they all have their own saws? Aren’t they doing them all the same? Shouldn’t they be able to have ‘common’ saws?” The simple answer is, “No, not usually.” Whenever circumstances force filers to work each other’s saws the result is seldom ideal. Cracks appear in saws that have never cracked and benchmen are heard grumbling about how their saws have been changed by the other benchman. Theoretically, they haven’t been changed at all since they all have the same target, but in reality, small changes in a balanced pattern can have large consequences.

One of the variants is in how a filer gauges tension. In a bandsaw for instance, the two most popular methods are “light gap” and “black to the gauge.” In the first, the saw gauge is ground so that when held to the saw, a thin sliver of light shows from edge to edge and the filer uses that gap to tell if the tension is uniform and that the amount is appropriate. A small amount of pressure is then applied to the gauge and if all is well then everything would go black. Most benchmen use this method but it is subjective to the way a benchman holds his gauge, the pressure that is applied, etc. The filer gets used to seeing what he expects to see in a properly benched saw. Someone else may view the same saw differently.

Other filers prefer to use a tension gauge that is ground to the curvature of the desired tension. When the saw has been levelled, the filer looks for no light between the tires when the gauge is held against the saw. The disadvantage to this method is bumps and tension problems can masquerade as “perfect” if a benchman isn’t very careful with what they’re doing. The black-out method is more often used by very experienced filers.  Again, the angle of the gauge, the pressure applied, all change the sight picture for different filers. Is there a right way and a wrong way? To a certain extent, yes - you can’t just do whatever you like and expect a positive result - but a filer that is confident in his chosen method will produce a better product every time.

When it comes to levelling, I myself prefer to use levelling rolls whenever practical. I believe that it does less damage to the saws, produces less filer-created bumps and is faster. My colleague, who is an excellent benchman, prefers the hammer. He isn’t wrong and neither am I, both methods work and the saws look a little different afterwards but everything runs and it runs properly. Metcalf vs diamond dresser, this brand of saw vs that, a V-gauge vs an RPM gauge, the list goes on and on…

The bottom line is that there is no bottom line. A saw has been done properly when a filer has put all of his/her knowledge and skill into the task and the saw subsequently performs properly for the full length of its run. Almost every filer will produce a different looking saw from one done by an equally skilled co-worker but they will usually run uniformly. That’s the beauty of saw filing.


Trevor Shpeley is the head filer for Tolko’s Kelowna division and is currently the financial secretary for the BC Saw Filers Association.

 

May 6, 2016 - Bosch Rexroth offers hydraulic training courses on-site at participants' locations, at several of the company's facilities in Canada, and online.

Download the 2016 Canadian Training course brochure at www.boschrexroth.ca/training.

Bosch Rexroth is accepting registration for all courses in its popular training program designed for industrial hydraulics and mobile hydraulic users, designers and engineers. Rexroth’s Hydraulic Technical Training is targeted toward individuals who maintain hydraulic systems, design new systems or want to upgrade existing systems with new technology.

Rexroth provides on-site training for specific hydraulic installations, and customized training programs are available with test stands delivered to the participant’s location. Online hydraulic training is also available as self-directed eLearning courses that include basic hydraulics as well as various technology specific courses including energy efficiency and electrification of hydraulics.

In addition to on-site and self-directed training, registration is now open for the following scheduled courses in Canada through December 2016:

  • HYi-101 (formerly POH) An introduction and comprehensive overview of industrial hydraulic technology
  • HYi-201 (formerly MRS) Maintenance personnel learn proper methods of commissioning, maintaining and trouble-shooting industrial hydraulic systems
  • HYi-202 (formerly DCH) Advanced maintenance technicians and hydraulic project engineers learn the aspects of efficient system/circuit design as well as component selection and sizing
  • HYi-301 (formerly PPM) Sizing, application, commissioning and troubleshooting fixed and variable displacement piston pumps and motors in open, closed and semi-closed industrial hydraulic circuits
  • HYi-302 (formerly PCT) Introduction and thorough overview of proportional valves and control electronics for advanced technicians, designers and engineers
  • HYi-303 (formerly PCD) Design concepts for proper selection, sizing and application of proportional and high response valves
  • HYm-101 (formerly IMHT) An introduction and comprehensive overview of mobile hydraulic technology
  • HYm-201 (formerly MHDCT) Advance your skills and in using and applying open and closed circuit mobile drives and controls

Courses are held at Bosch Rexroth facilities in Canada as well as additional courses at various locations in the U.S.

For a complete listing of available courses and dates, download the training brochure at www.boschrexroth.ca/training. Online registration for courses is available at www.boschrexroth.com/training/register.

About Bosch Rexroth
Economical, precise, safe, and energy efficient: drive and control technology from Bosch Rexroth moves machines and systems of any size. The company bundles global application experience in the market segments of Mobile Applications, Machinery Applications and Engineering, and Factory Automation to develop innovative components as well as tailored system solutions and services. Bosch Rexroth offers its customers hydraulics, electric drives and controls, gear technology, and linear motion and assembly technology all from one source. With locations in over 80 countries, more than 31,100 associates generated sales revenue of approximately 5.4 billion euros in 2015.To learn more, please visit www.boschrexroth.ca.

About Bosch
The Bosch Group is a leading global supplier of technology and services. It employs roughly 375,000 associates worldwide (as of December 31, 2015). According to preliminary figures, the company generated sales of more than 70 billion euros in 2015. Its operations are divided into four business sectors: Mobility Solutions, Industrial Technology, Consumer Goods, and Energy and Building Technology. The Bosch Group comprises Robert Bosch GmbH and its roughly 440 subsidiaries and regional companies in some 60 countries. Including sales and service partners, Bosch’s global manufacturing and sales network covers some 150 countries. The basis for the company’s future growth is its innovative strength. Bosch employs 55,800 associates in research and development at roughly 115 locations across the globe. The Bosch Group’s strategic objective is to deliver innovations for a connected life. Bosch improves quality of life worldwide with products and services that are innovative and spark enthusiasm. In short, Bosch creates technology that is “Invented for life.”
Additional information is available online at www.bosch.com, www.bosch-press.comand http://twitter.com/BoschPresse.

In the U.S., Canada and Mexico, the Bosch Group manufactures and markets automotive original equipment and aftermarket products, industrial drives and control technology, power tools, security and communication systems, packaging technology, thermotechnology, household appliances, healthcare telemedicine and software solutions. For more information, please visit www.boschusa.com,www.bosch.com.mx and www.bosch.ca.
April 26, 2016 - Tom Bishop of the Electrical Apparatus Service Association (EASA) sat down with Canadian Forest Industries to answer some of the frequently asked questions related to repairing and replacing energy-efficient motors:

How difficult is it to repair fabricated AC squirrel cage rotors - this type of failure was identified as not economically repairable?
In general, squirrel cage rotor rebuilding (rebarring) is a labor-intensive process. Die cast bars are usually removed in a chemical process; and fabricated bars are manually removed one at a time. Sometimes the thin steel disc laminations must be disassembled in order to remove the rotor bars. Therefore, this labor-intensive repair activity is not usually economically justified unless the motor is relatively large or has special features.

When discussing the repair versus replacement issue, we frequently do not have the efficiency of the older motor.  For large horsepower motors, the difference is not that large between old motors and current high efficiency motors. Is there a source to help estimate the efficiency of the older motors?
Small and medium motors manufactured prior to the high efficiency regulations rarely had efficiency levels on their nameplates. Further, the methods for testing of motor efficiency were refined in the era beginning with high efficiency motors. What this all means is that even if a pre-high efficiency motor rated efficiency were known, the level of accuracy would be questionable.  

A more practical but partially after-the-fact approach to assessing the impact on energy consumption would be to measure the motor power input for a specific load prior to replacement, and measure the power input after the replacement motor is installed. That would provide a direct comparison of energy consumption for a specific application.

What test should be done to a motor to assure nameplate efficiency after repair?
If the as-manufactured no load power input (no load watts) for the motor is known, the post-repair value can be compared to it. However, the as-manufactured power input is not often available from many manufacturers.  A more practical method is to follow known good practices that include testing at key decision points during repair, which is the approach used in the EASA Accreditation Program for service centres.

How do you know the efficiency in an old motor if it does not have a nameplate?
If the motor does not have a nameplate it may be possible to locate identifying information, such as a serial number stamped into the frame or shaft, that can be traced back to the original information if the motor manufacturer is known. However, that is rarely the case. Thus, in general, if the motor lacks a nameplate the efficiency cannot be estimated. Further, it may not be possible to accurately determine the motor power, voltage and current ratings.

Can the efficiency classification of a motor be increased by rewinding?
Although efficiency may be improved by rewinding, an increase great enough to result in a pre-high efficiency motor becoming high efficiency, or a high efficiency motor becoming NEMA Premium would not be possible.  

Of the total losses in a motor, how much relates to rewinding?
The losses directly affected by the rewinding process are stator winding copper and core losses. Stator copper losses are typically about 35 to 40 per cent of total losses; and stator core losses are typically about 10 to 15 per cent of total losses. Together they are about 50 to 55 per cent of total losses.

Should there be a concern about the difference in speed rating of a higher efficiency motor compared to an older motor?
The more efficient motor will typically have a higher full load speed rating; and if the application is a fan or a pump, the power requirement changes by the cube of the speed. For example, if a 1,725 rpm pump motor was replaced by a NEMA Premiummotor rated 1,790 rpm, the required power would be about 12 per cent greater [(1790/1725)3 = 1.12  12%].

Click here to read Tom Bishop’s feature article discussing whether to repair or replace energy-efficient motors.

April 19, 2016 - Most plant engineers and maintenance staff can attest to the reliability of standard-efficiency motors that have been repaired or rewound using industry best practices. They also know repair can cost far less than replacement, especially when the motor has special features. Despite this, some of them hesitate to have failed energy-efficient motors (NEMA Premium models, in particular) repaired because they’ve heard it degrades efficiency.

April 18, 2016 - Gap control is the one of the most critical items to control in a sawmill. It determines how accurate your cuts are, and the quality of your lumber. Having gap control means maintaining that perfect 0.0015” gap between the saw blade and the babbitt pad of the sawguide. I have always looked at sawguide accuracy as one of the top five ways of maintaining a perfect gap.

March 29, 2016 - The battle for skilled labour across Canada is hitting sawmills sooner rather than later, particularly in the filing rooms. To combat the shortage of qualified saw filers, some sawmills have been forced to hire back filers who have already retired on a contract basis to keep things in their filing rooms running smoothly.

March 28, 2016 - Named for its resemblance to the pattern of ridges on an old-style washing board, washboarding in a sawmill refers to the visible end result of conditions that combine to produce a self-perpetuating wave in a saw that causes the teeth to weave back and forth in the cut, leaving a textured-defect that can be difficult to plane out. The presence of washboard forces a sawmill to run larger target sizes and to feed the wood through the saws at a slower speed than desired, which has a direct and detrimental relationship with the mill’s production and recovery statistics.

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